Abstract

Bidirectional Texture Functions (BTFs) provide a realistic depiction of the appearance of many real-world materials as they contain the spatially varying light scattering behavior of the material surface. Since editing of existing BTF data is still in its early stages, materials have to be measured from real-world samples. In contrast to the related Spatially Varying BRDFs (SVBRDFs), the reflectance information encoded in a BTF also includes non-local scattering effects and therefore does not obey energy conservation or reciprocity. While this higher degree of freedom also contributes to an increased realism, it inadvertently calls for an extensive measurement of reflectance samples, as many regularization approaches from BRDF measurement do not apply. In this paper, we present an automated, parallelized, robust, fast and transportable setup for the acquisition of BTFs from flat samples as well as 3D objects using camera and light arrays: the DOME II. In contrast to previous camera array approaches, the present setup, which is comprised of high-quality industry grade components, overcomes several issues regarding stability, reliability and precision. It achieves a well balanced state-of-the-art acquisition performance in terms of speed and quality at reasonable costs.

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Bibtex

@INPROCEEDINGS{schwartz-2013-dome2wmam,
author = {Schwartz, Christopher and Sarlette, Ralf and Weinmann, Michael and Klein, Reinhard},
editor = {Rushmeier, Holly and Klein, Reinhard},
pages = {25--31},
title = {DOME II: A Parallelized BTF Acquisition System},
booktitle = {Eurographics Workshop on Material Appearance Modeling: Issues and Acquisition},
year = {2013},
month = jun,
publisher = {Eurographics Association},
location = {Zaragoza, Spain},
keywords = {Acquisition, BTF, Camera Array, Digital Material Appearance, Dome, Setup},
abstract = {Bidirectional Texture Functions (BTFs) provide a realistic depiction of the appearance of many
real-world materials as they contain the spatially varying light scattering behavior of the material
surface. Since editing of existing BTF data is still in its early stages, materials have to be
measured from real-world samples. In contrast to the related Spatially Varying BRDFs (SVBRDFs), the
reflectance information encoded in a BTF also includes non-local scattering effects and therefore
does not obey energy conservation or reciprocity. While this higher degree of freedom also
contributes to an increased realism, it inadvertently calls for an extensive measurement of
reflectance samples, as many regularization approaches from BRDF measurement do not apply. In this
paper, we present an automated, parallelized, robust, fast and transportable setup for the
acquisition of BTFs from flat samples as well as 3D objects using camera and light arrays: the DOME
II. In contrast to previous camera array approaches, the present setup, which is comprised of
high-quality industry grade components, overcomes several issues regarding stability, reliability
and precision. It achieves a well balanced state-of-the-art acquisition performance in terms of
speed and quality at reasonable costs.},
isbn = {978-3-905674-48-4},
url = {http://diglib.eg.org/EG/DL/WS/MAM/MAM2013/025-031.pdf},
doi = {10.2312/MAM.MAM2013.025-031}
}